The machine where I installed Oracle VM manager version 3.1.1 is totally lost accuse of hardware failure and unfortunately there is no backup taken for ovs schema nor for vm manager's config file as offline copy. I tried to install oracle vm manager o new machine, it is fine installed and ovs server is discovered properly, but my question is there a way to discover current ovs server configuration (Server pool, storage repository, network, ..., etc.) by the new oracle vm manager and change its ownership? or I have to re-install oracle vs which will cost a lot?

I have never had to do this, but just incase its helpful. The old vm.cfg for each VM should still be found on you NFS server in the repository you setup (assuming you used NFS). Unless someone has a better option, changing the appropiate UID's in the path may help. Here's an example to one of my VM's. You may also check the OVM Tools optional download to see if there are any usefull recovery utilities. There are likely wiser admin's here who can guide you better.... Good luck.

When I look at the console of mv VM servers, than there's the Manager UUID printed on the screen - you should make note of that and reinstall OVM Manager using the -u switch. Actually, you would use it like this: -u <UUID>.

After OVMM has been installed, you can discover one of the (potentially many) servers of your server pool and OVMM should read all relevant information from the server pool which always holds all the config data as well.

Well, if you already have rediscovered your VM servers then no, I don't think that you will be able to get back the repository. If you have OVM support they might be able to help you. I don't remember any command to reclaim a "lost" server pool.